Shiva Purana
श्यामश्च शबलश्चैव यममार्गानुरोधकौ ॥ यौ स्तस्ताभ्यां प्रयच्छामि तौ गृह्णीतामिमं बलिम् ॥ ३५॥
Shyama and Sabala are the obstructionists of the path of Yama I offer this offering to both of you who are present. Please accept this offering.
english translation
zyAmazca zabalazcaiva yamamArgAnurodhakau ॥ yau stastAbhyAM prayacchAmi tau gRhNItAmimaM balim ॥ 35॥
hk transliteration by Sanscript